WF4.0实战(十一):邮件通知
在工作流开发中,邮件通知是必不可少。这篇文章中,我将是使用WF4.0一步一步打造一个功能完整的邮件通知节点。
首先,新建一个WorkflowConsoleApplication项目,改名为MailNoticeDemo,如下图:
添加一个CodeActivity活动命名为MailNotice,添加一个ActivityDesigner活动命名为MailNoticeDesigner。项目结构如下图:
MailNotice用于写发送邮件的业务逻辑,MailNoticeDesigner用于设计活动的界面,现在MailNotice和MailNoticeDesigner是没有任何关联的,我们在MailNotice类上添加[Designer(typeof(MailNoticeDesigner))],关联MailNotice和MailNoticeDesigner,还需要引入System.ComponentModel命名空间,代码如下。
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using System.Activities; using System.ComponentModel; using System.Activities.Presentation.Metadata; using System.Activities.Presentation.PropertyEditing; using System; namespace MailNoticeDemo { [Designer(typeof(MailNoticeDesigner))] public sealed class MailNotice : CodeActivity {
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………
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}
这时,MailNotice和MailNoticeDesigner活动中还没有进行编码。在项目中引入一个邮件发送类MailHelper.cs,编写MailNotice代码,如下:
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[Designer(typeof(MailNoticeDesigner))]
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public sealed class MailNotice : CodeActivity
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{
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public InArgument<string> Receive { get; set; }
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public InArgument<string> Subject { get; set; }
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public InArgument<string> Content { get; set; }
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public string Attachment { get; set; }
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static MailNotice()
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{
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AttributeTableBuilder builder = new AttributeTableBuilder();
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builder.AddCustomAttributes(typeof(MailNotice), "Attachment", new EditorAttribute(typeof(FilePickerEditor), typeof(DialogPropertyValueEditor)));
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MetadataStore.AddAttributeTable(builder.CreateTable());
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}
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// If your activity returns a value, derive from CodeActivity<TResult>
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// and return the value from the Execute method.
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protected override void Execute(CodeActivityContext context)
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{
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SMTP smtp = new SMTP("你邮箱地址·", "显示的名称", new string[] { Receive.Get(context) }, null, null, Subject.Get(context), Content.Get(context), new string[] { Attachment }, "邮件发送服务", 25, "你邮箱地址·", "你邮箱密码", false);
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try
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{
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smtp.Send();
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}
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catch (Exception ex)
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{
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string error = ex.Message;
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if (ex.InnerException != null)
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{
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error = ex.InnerException.Message;
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}
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Console.WriteLine("邮箱发送失败: " + error);
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} }
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}
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设计MailNoticeDesigner活动的UI,设计UI之前让你可以先了解一下ExpressionTextBox。详见:expressiontextbox-101
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通过expressiontextbox和WPF的控件,设计UI界面如下:
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Xaml代码如下:
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<sap:ActivityDesigner x:Class="MailNoticeDemo.MailNoticeDesigner"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:sap="clr-namespace:System.Activities.Presentation;assembly=System.Activities.Presentation"
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xmlns:sapc="clr-namespace:System.Activities.Presentation.Converters;assembly=System.Activities.Presentation"
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xmlns:sapv="clr-namespace:System.Activities.Presentation.View;assembly=System.Activities.Presentation"
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mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="221" d:DesignWidth="336">
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<sap:ActivityDesigner.Resources>
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<ResourceDictionary x:Uid="ResourceDictionary_1">
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<sapc:ArgumentToExpressionConverter x:Uid="sadv:ArgumentToExpressionConverter_1" x:Key="ArgumentToExpressionConverter" />
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</ResourceDictionary>
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</sap:ActivityDesigner.Resources>
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<Grid Height="190" Width="328">
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<Grid.RowDefinitions>
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<RowDefinition Height="28"></RowDefinition>
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<RowDefinition Height="28"></RowDefinition>
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<RowDefinition Height="54"></RowDefinition>
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<RowDefinition Height="47" />
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<RowDefinition Height="31*" />
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</Grid.RowDefinitions>
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width=".2*"></ColumnDefinition>
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<ColumnDefinition Width=".8*"></ColumnDefinition>
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</Grid.ColumnDefinitions>
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<Label Content="收件人" Height="28" HorizontalAlignment="Left" Grid.Row="0" Grid.Column="0" Name="label1" VerticalAlignment="Top" />
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<sapv:ExpressionTextBox Grid.Row="0" Grid.Column="1"
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OwnerActivity="{Binding Path=ModelItem}"
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Expression="{Binding Path=ModelItem.Receive, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
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UseLocationExpression="False" />
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<Label Content="主题:" Grid.Row="1" Grid.Column="0" HorizontalAlignment="Left" Name="label2" VerticalAlignment="Top" />
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<sapv:ExpressionTextBox Grid.Row="1" Grid.Column="1"
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OwnerActivity="{Binding Path=ModelItem}"
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Expression="{Binding Path=ModelItem.Subject, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
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UseLocationExpression="False" />
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<Label Content="正文:" Grid.Row="2" HorizontalAlignment="Left" Name="label3" VerticalAlignment="Top" />
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<sapv:ExpressionTextBox Grid.Row="2" Grid.Column="1"
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OwnerActivity="{Binding Path=ModelItem}"
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Expression="{Binding Path=ModelItem.Content, Mode=TwoWay, Converter={StaticResource ArgumentToExpressionConverter}, ConverterParameter=In }"
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UseLocationExpression="False" Margin="0,0,0,1" Grid.RowSpan="2" />
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</Grid>
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</sap:ActivityDesigner>
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- 这样我们就完成了这个邮件活动。测试一下。在Workflow1中拖入这个活动。输入收件人、主题、正文,如下图:
- 设置附件,如下图:
- 启动工作流发送邮件:
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WorkflowInvoker.Invoke(new Workflow1());
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你会发现这个活动的图标不够美观,让我们修改一下这个自定义活动的图标。 在MailNoticeDesigner.xaml中加入下面代码
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<DrawingBrush>
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<DrawingBrush.Drawing>
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<ImageDrawing>
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<ImageDrawing.Rect>
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<Rect Location="0,0" Size="16,16" ></Rect>
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</ImageDrawing.Rect>
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<ImageDrawing.ImageSource>
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<BitmapImage UriSource="mail.ico" ></BitmapImage>
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</ImageDrawing.ImageSource>
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</ImageDrawing>
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</DrawingBrush.Drawing>
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</DrawingBrush>
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</sap:ActivityDesigner.Icon>
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设置图标mail.ico,将Build action设置为Resource,如下图:
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看一下我们最终打造的邮件活动:
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总结:这篇文章详细讲解了创建WF4.0一个自定义活动的完整过程,虽然很简单,但对创建自定义活动很有参考价值。
代码:/Files/zhuqil/MailNoticeDemo.rar
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(全文完)
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